Grinding wheel truing apparatus



Aug. 11., 1942. L, A. KAsPARsoN ETAfL 2,292,947 I GRINDING WHEEL TRUINGAPPARATUS Filed July 23, 1941 /DHN ENRE/DE Aug, 11, `194:2.

il.. A. KAs'PAR-soN Er An 292,947

GRINDING WHEEL TRUING APPARATUS Filea July 2s, 1941 2 sheets-smet 2Patented Aug. 1,1, 1942 2,292,947 GRINDING WHEEL TRUING APPARATUSLennart A. Kasparson, Worcester, and John l. Garside, West Boylston,Mass., assignors to Norton Company, Worcester, Mass., a corporation ofMassachusetts Application July 23, 1941, Serial No. 403,738

3 Claims.

The invention relates to grinding machines, and more particularly to agrinding wheel truing apparatus.

One object of the invention is to provide asimple and thoroughlypractical double angle grinding wheel truing apparatus. Another objectof the invention is to provide an improved angular grinding wheel truingapparatus in which a p air of diamonds or truing tools are arranged foran angular traversing movement to true either a cylindrical face or totrue diverging angular faces on a grinding wheel.. Other objects will bein part obvious or in part pointed out hereinafter.

The invention accordinglyconsists in the features of construction,combinations of elements,

` and arrangements of parts, as will be exemplified in the structure tobe hereinafter described, and the scope of the application of which willbeindicated in the following claims.

In the accompanying drawings, in which is shown one of various possibleembodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary cross sectional view through a grinding machine,illustrating the improved grinding Wheel truing apparatus in elevationand showing the grinding wheel feeding mechanism partly in section;

Fig. 2 is a plan view, on an enlarged scale, of the grinding wheeltruing apparatus;

Fig. 3 is a fragmentary front elevation, on an enlarged scale, of theimproved grinding wheel truing apparatus;

Fig. 4 is a vertical cross-sectional view, taken approximately on theline 4--4 of Fig. 2;

Fig. 5 is a fragmentary cross sectional view, taken approximately on thelirre 5--5 of Fig. 4; and

Fig. 6 is a fragmentary plan view, showing the relation of the truingtools and their paths of travel to the operative face of the grindingwheel.

A grinding machine has been illustrated in the drawings comprising 'abase I0 having a transversely movable grinding wheel slide II mounted onthe usual V-way and flat way (not shown) on the base I0. 'I'he wheelslide II serves asta support for a rotatable grinding wheel spindle I2which in turn serves as a support for a rotatable grinding wheel I3. Thegrinding wheel spindle I2 may be driven by any suitable source of power,such as those well known in the art, that is, either an. electric motormounted on the Wheel slide II, or an overhead drive shaft. A drivingbelt Il transmits power from the that shown in the prior U. S. patent toCharles source (not illustrated) to a pulley I5 mounted on the end ofthe wheel spindle I2.

` wheel 25.

H. Norton, No. '762,838 dated June 14, 1904, to which reference may behad for details of disclosure not contained herein. This feedingmechanism may comprise a depending half nut I6 which is fixedly mountedon the under side of the Wheel slide II and meshes with a rotatablecross feed screw I1. 'Ihe cross feed screw I1 is journalled in bearings(not shown) in the base I0. The forward end of the feed screw I1 isslidably keyed Within a rotatable sleeve I8 which is journalled in abearing surface I 9 formed 'within the base I-Il. Y

A shaft 20 is formed integralwith the sleeve I8 and is journalled in abearing 2I formed in the base I0. A gear 22 is mounted on the outer endof the shaft 20 and meshes with a pinion 23. The pinion 23 is rotatablysupported on a stud (not shown) to rotate with a gear 24 which is formedas a part of a manually operable feed A micrometer wheel feed adjustingmechanism 26 is provided whereby the infeeding movement of the grindingWheel I3 may be stopped in a desired adjusted'position.

A longitudinally reciprocable Work supporting table 21 is slidablysupported on a flat way 28 and a V-way 29 formed on the upper surface ofthe base I0 to support the table 21 for a longi- .tudinal reciprocatorymovement relative tothe base I0. The table 21 serves as a support forgarotatable work supporting mechanism and; also as a support for a truingapparatus to .-be here.- inafter described. The table 21 is arranged tobe traversed longitudinally by means of a rack bar 3I depending from theunder side of the table 21 by means of either a power operated or amanually operable traversing mechanism (not shown) such as, for example.substantiallythe same as that shown in the prior expired patent toNorton above referred to. l y

The improved truing apparatus comprises a pair of angularly adjustableand traversable diamonds or truing tools which are supported so that theentire assembly may be moved trans'- versely in a path substantiallynormalv to thev pivotal axes of the two angular 1 adjustxrie tofacilitate truing two angular operative fai" on the periphery of agrinding wheel` I3 A improved truing apparatus comprisesgal-Q plate 40which is preferably clampedto the upper surface of the table 21 by bolts4I and 42 (Figli), A dovetailed slideway 43 (Figs. 2 and 3) is formedmovable slide 55. The clamping vided with a frusto-conically shapedportion 11 which passes through'the frusto-conical aperture "13 in thestud 1|.

apparatus may be' adjusted transversely relative to the machine toposition the truing apparatus in the desired position relative to thegrinding wheel I3.

'I'he platen 44 serves as a support for a pivotally mounted plate 48which is pivotally supported on a tapered stud 49 (Fig. 4). Clampingscrew 45, the platen 44 supporting the truing screws 50 and 5| areprovided for clamping the plate 48 in adjusted position. The clampingscrews 50 and 5| pass through elongated arcuateshaped slots 52 and 53formed in the plate 48 and are screw threaded into the transverselymovable supporting platen 44. The platen 44 is provided with a graduatedscale 54 to facilitate angular adjustment of the plate 48 as desired. Itwill be readily apparent from the foregoing disclosure that the plate 48may be readily adjusted angularly by loosening the clamping screws 50and 5| and then swivelling the plate 48 to the desired angular position,after which the plate 48 may be readily clamped in adjusted position bytightening the clamping screws 50 and 5|.

A dovetailed slideway 54 is formed on the upper surface of the plate 48and is arranged to extend in a direction normal to the path oftransverse adjustment of the platen 44 when the platen 48 is set at zeroaccording to the scale 54. A longitudinally movable slide 55 is providedhaving a dovetailed slideway formed on its under surface which mateswith lthe dovetailed slideway 54. In order to facilitate a longitudinaltraversing movement of the slide 55, a rotatable feed screw 58 isjournalled in a bearing 51 formed in an end cap 58 supported at one endof the platen 48. 'I'he screw 56 meshes with or engages a nut 59depending from and formed integral with the under side of the slide 55.

A manually operable traversing mechanism is provided for the feed screw56, comprising a bevel gear 60 which is fixedly mounted on therighthandend of the feed screw 56 (Fig. 2). The bevel gear 60 in turn meshes witha bevel gear 6I which is flxedly mounted on a rotatable shaft 62. Theshaft 62- is journalled in a bearing 63 carried by a projecting portion64 of the end cap 58. A manually operable hand wheel 65 is mounted onthe outer end of the shaft 62. It will be readily apparent from theforegoing disclosure that a manual rotation of the hand wheel 65 will betransmitted through the gears 6| and 60 to rotate the feed screw 56 soas to traverse the slide 55 longitudinally relative to the supportingplate 48.

The longitudinally movable slide 55 in turn supports a swivel head 10.The swivel head 10 serves as a support for a pivot stud 1I (Fig. 4)which passes through a central aperture 12 formed in the longitudinallymovable slide 55. The stud 12 is provided with a frusto-conically shapedaperture 13. A clamping bolt 14 having a threaded portion is screwthreaded into an aperture 16 formed within the longitudinally bolt 14 isprol 'Ihe aperture 13 is larger in size than the frusto-conical portion11 of the clamping bolt 14. It will be readily apparent from theforegoing disclosure that when it is desired to clamp the swivel head 10in adjusted position, the binder or clamping screw 14 may be tightenedso that the frusto-conical portion 11 is moved toward the right, thusproducing a wedging action and causing a downward pull upon the pivotstud 1I to clamp the head 10 in the desired adjusted position. 'I'heswivel head 10 is provided with a graduated scale 18 on its peripheralsurface. An index point 19 is provided on a cylindrically shaped portionof the longitudinally movable slide 55 to facilitate angular adjustmentof the head 10 to the desired position.

The swivel head 10 is provided with a transversely extending V-Waycomprising a pair of angular positioned plane surfaces 80 and 8I whichserve as a support for a transversely movable slide 82. The slide 82 isprovided with a V- shaped slideway having surfaces mating with thesurfaces 80 and 8| of the swivel head 10. A nut and screw mechanism isprovided for traversing the slide 82 transversely relative to the swivelhead 10, comprising a rotatable feed screw 83 which engages or mesheswith a threaded aperture 84 within the slide 82. 'I'he screw 83 isjournalled in a bearing 85 which is supported in.fixed position on theswivel head 10. A gear 86 formed integral with the feed screw 83 mesheswith a gear 81 which is fixedly supported on a rotatable shaft 88. Theshaft 88 is journalled in bearings 89 and 90 which are supported infixed relationship with the swivel head 10. A manually operable wheel 9|is mounted on the outer end of the shaft 88 by means of which the gear81, the gear 86, and the feed screw 83 may be rotated as desired totraverse the slide 82 transversely relative to the swivel head 10.

In order to maintain the slide 82 in sliding engagement with the V-Way80-8I, a shoe 92 extends longitudinally along the upper surface of theslide 82 (Fig. 4). A plurality of adjusting screws 93, 94 and 95 areprovided for manually adjusting the position of the shoe 92 so that theslide 82 may be maintained in sliding engagement with the supportingways without any lost motion. A pair of pull screws 96 and 91 areprovided to cooperate with the screws 93, 94 and 95 to facilitateadjustment of the shoe 92,

A stud 98 mounted on the upper end of the pivot stud 1| is locatedWithin a groove 99 formed in the under surface of the slide 82. It willbe noted in Fig. 4-that the groove 99 extends only part of the length ofthe slide 82 and is arranged to limit the transverse movement of theslide 82 in either direction.

'I'he slide 82 serves as a support for the truing tools. A truing toolhead |00 is xedly mounted on the forward end of the slide 82 and isarranged to serve as a support for a pair of diamonds or truing toolsIOI and |02 which are arranged to true two angularly disposed adjacentfaces |03 and |04 (Fig. 6), respectively, on the grinding Wheel I3.

The operation of this improved truing apparatus will be readily apparentfrom the foregoing disclosure. The supporting platen 44 is rsttransversely adjusted to position the truing apparatus with respect tothe grinding wheel I3. The swivel platen 48 is then adjusted angularlyto the desired extent so that when the hand wheel 65 is rotated toproduce a longitudinal traversing movement of the slide 55, the truingtool I0| will travel in a direction indicated by the arrow-headed brokenline (Fig. 6), after which the clamping screws 50 and 5| are tightenedto lock the swivel plate-40 in the desired adiusted position.

Similarly, the swivel head may be adjusted angularly relative to thelongitudinally movable slide 55 so that the truing tool |02 will travelin av path indicated by the arrow-headed broken line |00 to true theface |03 of the grinding wheel I3. The swivel head 'I0 may then beclamped in adjusted position by tightening the binder bolt or screw 14.

The grinding wheel I0 may then be trued by rst rotating the hand wheel55 to traverse the slide 55 longitudinally to traverse the truing toolI0| across the face |04 of the grinding wheel I3 (Fig. 6). After thefaoe|04 has been trued to the desired extent, the truing tool |02 may betraversed transversely by rotation of the hand wheel 9| to true the face|03 of the grinding wheel I3. Before or during the truing operation,thegrinding wheel I3 may be advanced to compensate for wheel wear topresent'th'e face of the grinding wheel I3 fora truing operation byadjustmentv of the micrometer feed device 26 and rotation of the feedwheel 25 and feed screw It will be readily apparent from the foregoingdisclosure that either a cylindrical face, a single angular face, or apair of angular faces of the desired degree may be trued upon theperiphery of a grinding wheel I3. It is merely necessary to adjustthepath of travel of the longitudinal slide 55 and the swivel head 10 toobtain the desired traversing movement of the truing' tools IOI and |02to generate the desired operativel face on the grinding wheel I3.

It will thus be .seen that there has been provided by this inventionapparatus in which the various objects hereinabove set forth togetherwith many thoroughly practical advantages are successfully achieved. Asmany possible embodiments may be made of the above invention and amovable slide to pass one of said diamonds across i as many changesmight be made in the embodiment above set forth, it is tobe understoodthat all matter hereinbefore set forth or shown in the accompanyingdrawings is to be interpreted as illustrative and not in a limitingsense.

We claim: l Y 1. In a grinding wheel truingapparatus having a base,a'longitudinally movable slide thereon, a transversely movableslide onsaid longitudinally movable slide, means adjustably to swivel saidlongitudinally movable slide relative to said base, means adjustably toswivel said transversely y movable slide relative to said longitudinallymovable slide, and a truing tool head on said transversely` movableslide having a pair ofspaced truing tools which are arranged repeatedlyand successively to true angularly disposed faces ona grinding wheelwhen the longitudinal and transversely movable slides are traversedwith'out angular readjustment of said slides.

2. In a grinding wheel truing apparatus having a base, a longitudinallymovable slide thereon, a

transversely movable slide on said longitudinally movable slide, meansadjustably to swivel said longitudinally movable slide relative to thebase. means adjustably to swivel the transversely mov"- able sliderelative to the longitudinally movable slide, a truing tool head on saidtransversely movable slide having a pair of spaced truing tools thereon,means to traverse said longitudinally an angular face of a grindingwheel, and means to traverse the transversely movable slide to traversethe other of said diamonds across a second angularly disposed operativeface on the grinding wheel, said slides and truing tools being arrangedso that predetermined angular faces on the grinding wheel may berepeatedly and successively trued without readjustment of the slides ortruing tools. y

3. In a grinding Wheel truing apparatus, a base, a transversely movableslide thereon, an angularly adjustable platen on said slide, alongitudinally traversable slide on said platen, an angularly adjustablehead on said slide, a transversely traversable slide on said head, and atruing tool head having a pair of` truing tools which are arranged totrue diverging angularly disposed faces on a grinding wheel when thelongitudinally and transversely movable slides are traversed, saidslides and truing tools being arranged so that predetermined angularfaces on the grinding wheel may be repeatedly and suc

